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Calculate the number 3840

NUMBERMANIA: Calculate the number 3840 using numbers [9, 5, 8, 4, 58, 685] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 9

The first user who solved this task is Nasrin 24 T.

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Tourists

A group of American tourists was being guided through an ancient castle in Europe.

"This place," the guide told them, "is 600 years old. Not a stone in it has been touched, nothing altered, nothing replaced in all those years."

"Wow," said one woman dryly, "they must have the same landlord I have."

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Radar signal bounced off Sun

In 1959, the first distinguishable echo was recorded of a radar signal bounced off the Sun—considered a milestone in the emerging field of radar astronomy. A three-person team from the Radioscience Laboratory, Stamford University, led by electrical engineering Professor Von R. Eshleman, recorded an echo from the outer corona of the sun, 17 min. after transmission. They used an IBM computer for signal processing. The echo signal was extracted from a background noise 10,000 times greater due to the Sun's normal radio radiation. Earlier in 1959, a team at MIT had bounced a radar signal off Venus, 18 million miles away. The Stamford team set a new record distance with the Sun, a difficult target at 93 million miles away. Their accomplishment was published in Science (5 Feb 1960, p.329-33).«

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